Question

我在Spring Boot项目中使用Spring Webflux和ReactiveMongoRepository，并且我希望每个通量都是对象列表，如下所示：

// 1st Flux Started:
[
{
// 1st Dashboard
},
{
// 2nd Dashboard
}
]
// 1st Flux Ended
// 2nd Flux Started:
[
{
// 1st Dashboard
},
{
// 2nd Dashboard
}
]
// 2nd Flux Ended

存储库：

@Repository
public interface ReactiveDashboardRepository extends ReactiveMongoRepository<Dashboard, String> {
}

服务：

@Service
public class ReactiveDashboardServiceImpl implements ReactiveDashboardService {

    private ReactiveDashboardRepository reactiveDashboardRepository;

    public ReactiveDashboardServiceImpl(ReactiveDashboardRepository reactiveDashboardRepository) {
        this.reactiveDashboardRepository = reactiveDashboardRepository;
    }

    public Flux<Dashboard> getDashboards() {

        return this.reactiveDashboardRepository.findAll();
    }


}

控制器：

@CrossOrigin
@RestController
@RequestMapping("/api/sse")
public class ReactiveDashboardRestController {

    private ReactiveDashboardService reactiveDashboardService;

    public ReactiveDashboardRestController(ReactiveDashboardService reactiveDashboardService) {
        this.reactiveDashboardService = reactiveDashboardService;
    }

    @GetMapping(value = "/dashboards", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public Flux<Dashboard> getDashboards() {
        return this.reactiveDashboardService.getDashboards();
    }

}

因此，基本上，我希望数组中的所有对象成为单个流的一部分，因为这是我将要使用的客户端应用程序的设计方式。到目前为止，总共只有3个。因此，在每个流中将保存所有对象的数组。我知道这不是webflux的最佳用法。如果可以实现，该如何实现？

Answer 1

如果要无限大的磁通以间隔发送数据，则需要函数“ interval”。

为简单起见，我建议直接在List中返回仪表板，并在Controller中以Flux转换List。

它将是这样的：

    List<Dashboard> lDashBoard = new ArrayList<Dashboard>(Arrays.asList(
            Dashboard.builder().name("Dash1").build(),
            Dashboard.builder().name("Dash2").build(),
            Dashboard.builder().name("Dash3").build()
            ));
    Flux<List<Dashboard>> intervalFlux = Flux
            .interval(Duration.ofMillis(500))
            .map(tick -> {
                return lDashBoard;
            });
    intervalFlux.subscribe(t->log.info("Dashboards:{}", lDashBoard));

输出如下：

2018-11-14 15:55:18.575  INFO [Dashboards:[Dashboard(name=Dash1), Dashboard(name=Dash2), Dashboard(name=Dash3)]
2018-11-14 15:55:19.073  INFO [Dashboards:[Dashboard(name=Dash1), Dashboard(name=Dash2), Dashboard(name=Dash3)]
2018-11-14 15:55:19.573  INFO [Dashboards:[Dashboard(name=Dash1), Dashboard(name=Dash2), Dashboard(name=Dash3)]

如何使用Spring Webflux创建列表流？

1 个答案: